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replace RefCell with Cell in FnCtxt

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This commit is contained in:
Bastian Kauschke 2021-01-23 11:47:38 +01:00
parent 1986b58c64
commit 688cf6406a
6 changed files with 18 additions and 23 deletions
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2
compiler/rustc_typeck/src/check/check.rs
View File

@ -66,7 +66,7 @@ pub(super) fn check_fn<'a, 'tcx>(
// Create the function context. This is either derived from scratch or,
// in the case of closures, based on the outer context.
let mut fcx = FnCtxt::new(inherited, param_env, body.value.hir_id);
*fcx.ps.borrow_mut() = UnsafetyState::function(fn_sig.unsafety, fn_id);
fcx.ps.set(UnsafetyState::function(fn_sig.unsafety, fn_id));
let tcx = fcx.tcx;
let sess = tcx.sess;

10
compiler/rustc_typeck/src/check/coercion.rs
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@ -1472,22 +1472,22 @@ impl<'tcx, 'exprs, E: AsCoercionSite> CoerceMany<'tcx, 'exprs, E> {
fn_output = Some(&fn_decl.output); // `impl Trait` return type
}
}
if let (Some(sp), Some(fn_output)) = (fcx.ret_coercion_span.borrow().as_ref(), fn_output) {
self.add_impl_trait_explanation(&mut err, cause, fcx, expected, *sp, fn_output);
if let (Some(sp), Some(fn_output)) = (fcx.ret_coercion_span.get(), fn_output) {
self.add_impl_trait_explanation(&mut err, cause, fcx, expected, sp, fn_output);
}
if let Some(sp) = fcx.ret_coercion_span.borrow().as_ref() {
if let Some(sp) = fcx.ret_coercion_span.get() {
// If the closure has an explicit return type annotation,
// then a type error may occur at the first return expression we
// see in the closure (if it conflicts with the declared
// return type). Skip adding a note in this case, since it
// would be incorrect.
if !err.span.primary_spans().iter().any(|span| span == sp) {
if !err.span.primary_spans().iter().any(|&span| span == sp) {
let hir = fcx.tcx.hir();
let body_owner = hir.body_owned_by(hir.enclosing_body_owner(fcx.body_id));
if fcx.tcx.is_closure(hir.body_owner_def_id(body_owner).to_def_id()) {
err.span_note(
*sp,
sp,
&format!(
"return type inferred to be `{}` here",
fcx.resolve_vars_if_possible(expected)

8
compiler/rustc_typeck/src/check/expr.rs
View File

@ -680,14 +680,14 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
if self.ret_coercion.is_none() {
self.tcx.sess.emit_err(ReturnStmtOutsideOfFnBody { span: expr.span });
} else if let Some(ref e) = expr_opt {
if self.ret_coercion_span.borrow().is_none() {
*self.ret_coercion_span.borrow_mut() = Some(e.span);
if self.ret_coercion_span.get().is_none() {
self.ret_coercion_span.set(Some(e.span));
}
self.check_return_expr(e);
} else {
let mut coercion = self.ret_coercion.as_ref().unwrap().borrow_mut();
if self.ret_coercion_span.borrow().is_none() {
*self.ret_coercion_span.borrow_mut() = Some(expr.span);
if self.ret_coercion_span.get().is_none() {
self.ret_coercion_span.set(Some(expr.span));
}
let cause = self.cause(expr.span, ObligationCauseCode::ReturnNoExpression);
if let Some((fn_decl, _)) = self.get_fn_decl(expr.hir_id) {

9
compiler/rustc_typeck/src/check/fn_ctxt/checks.rs
View File

@ -23,7 +23,6 @@ use rustc_span::{self, MultiSpan, Span};
use rustc_trait_selection::traits::{self, ObligationCauseCode, StatementAsExpression};
use crate::structured_errors::StructuredDiagnostic;
use std::mem::replace;
use std::slice;
impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
@ -589,11 +588,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
blk: &'tcx hir::Block<'tcx>,
expected: Expectation<'tcx>,
) -> Ty<'tcx> {
let prev = {
let mut fcx_ps = self.ps.borrow_mut();
let unsafety_state = fcx_ps.recurse(blk);
replace(&mut *fcx_ps, unsafety_state)
};
let prev = self.ps.replace(self.ps.get().recurse(blk));
// In some cases, blocks have just one exit, but other blocks
// can be targeted by multiple breaks. This can happen both
@ -709,7 +704,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
self.write_ty(blk.hir_id, ty);
*self.ps.borrow_mut() = prev;
self.ps.set(prev);
ty
}

8
compiler/rustc_typeck/src/check/fn_ctxt/mod.rs
View File

@ -66,11 +66,11 @@ pub struct FnCtxt<'a, 'tcx> {
pub(super) in_tail_expr: bool,
/// First span of a return site that we find. Used in error messages.
pub(super) ret_coercion_span: RefCell<Option<Span>>,
pub(super) ret_coercion_span: Cell<Option<Span>>,
pub(super) resume_yield_tys: Option<(Ty<'tcx>, Ty<'tcx>)>,
pub(super) ps: RefCell<UnsafetyState>,
pub(super) ps: Cell<UnsafetyState>,
/// Whether the last checked node generates a divergence (e.g.,
/// `return` will set this to `Always`). In general, when entering
@ -127,9 +127,9 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
ret_coercion_impl_trait: None,
ret_type_span: None,
in_tail_expr: false,
ret_coercion_span: RefCell::new(None),
ret_coercion_span: Cell::new(None),
resume_yield_tys: None,
ps: RefCell::new(UnsafetyState::function(hir::Unsafety::Normal, hir::CRATE_HIR_ID)),
ps: Cell::new(UnsafetyState::function(hir::Unsafety::Normal, hir::CRATE_HIR_ID)),
diverges: Cell::new(Diverges::Maybe),
has_errors: Cell::new(false),
enclosing_breakables: RefCell::new(EnclosingBreakables {

4
compiler/rustc_typeck/src/check/mod.rs
View File

@ -184,14 +184,14 @@ impl UnsafetyState {
UnsafetyState { def, unsafety, unsafe_push_count: 0, from_fn: true }
}
pub fn recurse(&mut self, blk: &hir::Block<'_>) -> UnsafetyState {
pub fn recurse(self, blk: &hir::Block<'_>) -> UnsafetyState {
use hir::BlockCheckMode;
match self.unsafety {
// If this unsafe, then if the outer function was already marked as
// unsafe we shouldn't attribute the unsafe'ness to the block. This
// way the block can be warned about instead of ignoring this
// extraneous block (functions are never warned about).
hir::Unsafety::Unsafe if self.from_fn => *self,
hir::Unsafety::Unsafe if self.from_fn => self,
unsafety => {
let (unsafety, def, count) = match blk.rules {